Log Message:
devel/ruby-regexp_parser: update to 2.1.1

2.1.1 (2021-02-23)

Fixed

* fixed NameError when requiring only 'regexp_parser/scanner' in v2.1.0
  o thanks to Jared White and Sam Ruby for the report

2.1.0 (2021-02-22)

Added

* common ancestor for all scanning/parsing/lexing errors
  o Regexp::Parser::Error can now be rescued as a catch-all
  o the following errors (and their many descendants) now inherit from it:
	- Regexp::Expression::Conditional::TooManyBranches
	- Regexp::Parser::ParserError
	- Regexp::Scanner::ScannerError
	- Regexp::Scanner::ValidationError
	- Regexp::Syntax::SyntaxError
  o it replaces ArgumentError in some rare cases
    (Regexp::Parser.parse('?'))
  o thanks to sandstrom for the cue

Fixed

* fixed scanning of whole-pattern recursion calls \g<0> and \g'0'
  o a regression in v2.0.1 had caused them to be scanned as literals
* fixed scanning of some backreference and subexpression call edge cases
  o e.g. \k<+1>, \g<x-1>
* fixed tokenization of some escapes in character sets
  o ., |, {, }, (, ), ^, $, ?, +, *
  o all of these correctly emitted #type :literal and #token :literal if
    not escaped
  o if escaped, they emitted e.g. #type :escape and #token :group_open for
    [\(]
  o the escaped versions now correctly emit #type :escape and #token
    :literal
* fixed handling of control/metacontrol escapes in character sets
  o e.g. [\cX], [\M-\C-X]
  o they were misread as bunch of individual literals, escapes, and ranges
* fixed some cases where calling #dup/#clone on expressions led to shared
  state